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Earnings Per Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Earnings Per Share [Line Items]    
Options granted to purchase of common stock 104,444  
Diluted effect 8,555 4,278
Restricted Stock [Member]
   
Earnings Per Share [Line Items]    
Nonvested shares issued to members and directors 136,080 136,080
Performance Shares [Member]
   
Earnings Per Share [Line Items]    
Nonvested shares issued to members and directors 98,441 98,441